455 lines
18 KiB
C#
455 lines
18 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using CommunityToolkit.Diagnostics;
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using CommunityToolkit.Mvvm.ComponentModel;
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using CommunityToolkit.Mvvm.Messaging;
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using Wino.Calendar.ViewModels.Data;
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using Wino.Calendar.ViewModels.Interfaces;
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using Wino.Core.Domain.Collections;
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using Wino.Core.Domain.Enums;
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using Wino.Core.Domain.Interfaces;
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using Wino.Core.Domain.Models.Calendar;
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using Wino.Core.Domain.Models.Calendar.CalendarTypeStrategies;
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using Wino.Core.Domain.Models.Navigation;
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using Wino.Core.ViewModels;
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using Wino.Messaging.Client.Calendar;
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namespace Wino.Calendar.ViewModels
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{
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public partial class CalendarPageViewModel : CalendarBaseViewModel,
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IRecipient<LoadCalendarMessage>,
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IRecipient<CalendarSettingsUpdatedMessage>
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{
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[ObservableProperty]
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private ObservableRangeCollection<DayRangeRenderModel> _dayRanges = [];
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[ObservableProperty]
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private int _selectedDateRangeIndex;
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[ObservableProperty]
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private DayRangeRenderModel _selectedDayRange;
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[ObservableProperty]
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private bool _isCalendarEnabled = true;
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// TODO: Get rid of some of the items if we have too many.
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private const int maxDayRangeSize = 10;
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private readonly ICalendarService _calendarService;
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private readonly IAccountCalendarStateService _accountCalendarStateService;
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private readonly IPreferencesService _preferencesService;
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// Store latest rendered options.
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private CalendarDisplayType _currentDisplayType;
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private int _displayDayCount;
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private SemaphoreSlim _calendarLoadingSemaphore = new(1);
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private bool isLoadMoreBlocked = false;
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private CalendarSettings _currentSettings = null;
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public IStatePersistanceService StatePersistanceService { get; }
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public CalendarPageViewModel(IStatePersistanceService statePersistanceService,
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ICalendarService calendarService,
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IAccountCalendarStateService accountCalendarStateService,
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IPreferencesService preferencesService)
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{
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StatePersistanceService = statePersistanceService;
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_calendarService = calendarService;
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_accountCalendarStateService = accountCalendarStateService;
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_preferencesService = preferencesService;
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}
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// TODO: Replace when calendar settings are updated.
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// Should be a field ideally.
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private BaseCalendarTypeDrawingStrategy GetDrawingStrategy(CalendarDisplayType displayType)
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{
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return displayType switch
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{
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CalendarDisplayType.Day => new DayCalendarDrawingStrategy(_currentSettings),
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CalendarDisplayType.Week => new WeekCalendarDrawingStrategy(_currentSettings),
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_ => throw new NotImplementedException(),
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};
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}
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public override void OnNavigatedFrom(NavigationMode mode, object parameters)
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{
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// Do not call base method because that will unregister messenger recipient.
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// This is a singleton view model and should not be unregistered.
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}
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public override void OnNavigatedTo(NavigationMode mode, object parameters)
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{
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base.OnNavigatedTo(mode, parameters);
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_currentSettings = _preferencesService.GetCurrentCalendarSettings();
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}
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partial void OnIsCalendarEnabledChanging(bool oldValue, bool newValue) => Messenger.Send(new CalendarEnableStatusChangedMessage(newValue));
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private bool ShouldResetDayRanges(LoadCalendarMessage message)
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{
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if (message.ForceRedraw) return true;
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// Never reset if the initiative is from the app.
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if (message.CalendarInitInitiative == CalendarInitInitiative.App) return false;
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// 1. Display type is different.
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// 2. Day display count is different.
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// 3. Display date is not in the visible range.
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var loadedRange = GetLoadedDateRange();
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if (loadedRange == null) return false;
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return
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(_currentDisplayType != StatePersistanceService.CalendarDisplayType ||
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_displayDayCount != StatePersistanceService.DayDisplayCount ||
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!(message.DisplayDate >= loadedRange.StartDate && message.DisplayDate <= loadedRange.EndDate));
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}
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public async void Receive(LoadCalendarMessage message)
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{
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await _calendarLoadingSemaphore.WaitAsync();
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try
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{
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await ExecuteUIThread(() => IsCalendarEnabled = false);
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if (ShouldResetDayRanges(message))
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{
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DayRanges.Clear();
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Debug.WriteLine("Will reset day ranges.");
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}
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else if (ShouldScrollToItem(message))
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{
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// Scroll to the selected date.
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Messenger.Send(new ScrollToDateMessage(message.DisplayDate));
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Debug.WriteLine("Scrolling to selected date.");
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return;
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}
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// This will replace the whole collection because the user initiated a new render.
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await RenderDatesAsync(message.CalendarInitInitiative,
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message.DisplayDate,
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CalendarLoadDirection.Replace);
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}
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catch (Exception ex)
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{
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Debugger.Break();
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}
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finally
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{
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_calendarLoadingSemaphore.Release();
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await ExecuteUIThread(() => IsCalendarEnabled = true);
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}
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}
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private DateRange GetLoadedDateRange()
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{
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if (DayRanges.Count == 0) return null;
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var minimumLoadedDate = DayRanges[0].CalendarRenderOptions.DateRange.StartDate;
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var maximumLoadedDate = DayRanges[DayRanges.Count - 1].CalendarRenderOptions.DateRange.EndDate;
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return new DateRange(minimumLoadedDate, maximumLoadedDate);
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}
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private async Task RenderDatesAsync(CalendarInitInitiative calendarInitInitiative,
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DateTime? loadingDisplayDate = null,
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CalendarLoadDirection calendarLoadDirection = CalendarLoadDirection.Replace)
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{
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// This is the part we arrange the flip view calendar logic.
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/* Loading for a month of the selected date is fine.
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* If the selected date is in the loaded range, we'll just change the selected flip index to scroll.
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* If the selected date is not in the loaded range:
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* 1. Detect the direction of the scroll.
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* 2. Load the next month.
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* 3. Replace existing month with the new month.
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*/
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// 2 things are important: How many items should 1 flip have, and, where we should start loading?
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// User initiated renders must always have a date to start with.
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if (calendarInitInitiative == CalendarInitInitiative.User) Guard.IsNotNull(loadingDisplayDate, nameof(loadingDisplayDate));
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var strategy = GetDrawingStrategy(StatePersistanceService.CalendarDisplayType);
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var displayDate = loadingDisplayDate.GetValueOrDefault();
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// How many days should be placed in 1 flip view item?
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int eachFlipItemCount = strategy.GetRenderDayCount(displayDate, StatePersistanceService.DayDisplayCount);
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DateRange flipLoadRange = null;
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var initializedDateRange = GetLoadedDateRange();
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if (calendarInitInitiative == CalendarInitInitiative.User || initializedDateRange == null)
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{
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flipLoadRange = strategy.GetRenderDateRange(displayDate, StatePersistanceService.DayDisplayCount);
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}
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else
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{
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// App is trying to load.
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// This should be based on direction. We'll load the next or previous range.
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// DisplayDate is either the start or end date of the current visible range.
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if (calendarLoadDirection == CalendarLoadDirection.Previous)
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{
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flipLoadRange = strategy.GetPreviousDateRange(initializedDateRange, StatePersistanceService.DayDisplayCount);
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}
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else
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{
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flipLoadRange = strategy.GetNextDateRange(initializedDateRange, StatePersistanceService.DayDisplayCount);
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}
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}
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// Create day ranges for each flip item until we reach the total days to load.
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int totalFlipItemCount = (int)Math.Ceiling((double)flipLoadRange.TotalDays / eachFlipItemCount);
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List<DayRangeRenderModel> renderModels = new();
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for (int i = 0; i < totalFlipItemCount; i++)
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{
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var startDate = flipLoadRange.StartDate.AddDays(i * eachFlipItemCount);
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var endDate = startDate.AddDays(eachFlipItemCount);
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var range = new DateRange(startDate, endDate);
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var renderOptions = new CalendarRenderOptions(range, _currentSettings);
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renderModels.Add(new DayRangeRenderModel(renderOptions));
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}
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// Dates are loaded. Now load the events for them.
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foreach (var renderModel in renderModels)
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{
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await InitializeCalendarEventsAsync(renderModel).ConfigureAwait(false);
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}
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CalendarLoadDirection animationDirection = calendarLoadDirection;
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bool removeCurrent = calendarLoadDirection == CalendarLoadDirection.Replace;
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if (calendarLoadDirection == CalendarLoadDirection.Replace)
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{
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// New date ranges are being replaced.
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// We must preserve existing selection if any, add the items before/after the current one, remove the current one.
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// This will make sure the new dates are animated in the correct direction.
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isLoadMoreBlocked = true;
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// Remove all other dates except this one.
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await ExecuteUIThread(() =>
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{
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DayRanges.RemoveRange(DayRanges.Where(a => a != SelectedDayRange).ToList());
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});
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animationDirection = displayDate <= SelectedDayRange?.CalendarRenderOptions.DateRange.StartDate ?
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CalendarLoadDirection.Previous : CalendarLoadDirection.Next;
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}
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if (animationDirection == CalendarLoadDirection.Next)
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{
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await ExecuteUIThread(() =>
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{
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foreach (var item in renderModels)
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{
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DayRanges.Add(item);
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}
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});
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}
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else if (animationDirection == CalendarLoadDirection.Previous)
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{
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// Wait for the animation to finish.
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// Otherwise it somehow shutters a little, which is annoying.
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if (!removeCurrent) await Task.Delay(350);
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// Insert each render model in reverse order.
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for (int i = renderModels.Count - 1; i >= 0; i--)
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{
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await ExecuteUIThread(() =>
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{
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DayRanges.Insert(0, renderModels[i]);
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});
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}
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}
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Debug.WriteLine($"Flip count: ({DayRanges.Count})");
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foreach (var item in DayRanges)
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{
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Debug.WriteLine($"- {item.CalendarRenderOptions.DateRange.ToString()}");
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}
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if (removeCurrent)
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{
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await ExecuteUIThread(() =>
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{
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DayRanges.Remove(SelectedDayRange);
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});
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}
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// TODO...
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// await TryConsolidateItemsAsync();
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isLoadMoreBlocked = false;
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// Only scroll if the render is initiated by user.
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// Otherwise we'll scroll to the app rendered invisible date range.
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if (calendarInitInitiative == CalendarInitInitiative.User)
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{
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// Save the current settings for the page for later comparison.
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_currentDisplayType = StatePersistanceService.CalendarDisplayType;
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_displayDayCount = StatePersistanceService.DayDisplayCount;
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Messenger.Send(new ScrollToDateMessage(displayDate));
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}
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}
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private async Task InitializeCalendarEventsAsync(DayRangeRenderModel dayRangeRenderModel)
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{
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// Load for each selected calendar from the state.
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var checkedCalendarViewModels = _accountCalendarStateService.GroupedAccountCalendars
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.SelectMany(a => a.AccountCalendars)
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.Where(b => b.IsChecked);
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foreach (var calendarViewModel in checkedCalendarViewModels)
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{
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// Check all the events for the given date range and calendar.
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// Then find the day representation for all the events returned, and add to the collection.
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var events = await _calendarService.GetCalendarEventsAsync(calendarViewModel,
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dayRangeRenderModel.Period.Start,
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dayRangeRenderModel.Period.End)
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.ConfigureAwait(false);
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foreach (var calendarItem in events)
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{
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var calendarDayModel = dayRangeRenderModel.CalendarDays.FirstOrDefault(a => a.RepresentingDate.Date == calendarItem.StartTime.Date);
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if (calendarDayModel == null) continue;
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var calendarItemViewModel = new CalendarItemViewModel(calendarItem);
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await ExecuteUIThread(() =>
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{
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// TODO: EventsCollection should not take CalendarItem, but CalendarItemViewModel.
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// Enforce it later on.
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calendarDayModel.EventsCollection.Add(calendarItemViewModel);
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});
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}
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}
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}
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private async Task TryConsolidateItemsAsync()
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{
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// Check if trimming is necessary
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if (DayRanges.Count > maxDayRangeSize)
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{
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Debug.WriteLine("Trimming items.");
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isLoadMoreBlocked = true;
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var removeCount = DayRanges.Count - maxDayRangeSize;
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await Task.Delay(500);
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// Right shifted, remove from the start.
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if (SelectedDateRangeIndex > DayRanges.Count / 2)
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{
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DayRanges.RemoveRange(DayRanges.Take(removeCount).ToList());
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}
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else
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{
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// Left shifted, remove from the end.
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DayRanges.RemoveRange(DayRanges.Skip(DayRanges.Count - removeCount).Take(removeCount));
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}
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SelectedDateRangeIndex = DayRanges.IndexOf(SelectedDayRange);
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}
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}
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private bool ShouldScrollToItem(LoadCalendarMessage message)
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{
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// Never scroll if the initiative is from the app.
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if (message.CalendarInitInitiative == CalendarInitInitiative.App) return false;
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// Nothing to scroll.
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if (DayRanges.Count == 0) return false;
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var initializedDateRange = GetLoadedDateRange();
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if (initializedDateRange == null) return false;
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var selectedDate = message.DisplayDate;
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return selectedDate >= initializedDateRange.StartDate && selectedDate <= initializedDateRange.EndDate;
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}
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partial void OnSelectedDayRangeChanged(DayRangeRenderModel value)
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{
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if (DayRanges.Count == 0 || SelectedDateRangeIndex < 0) return;
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var selectedRange = DayRanges[SelectedDateRangeIndex];
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Messenger.Send(new VisibleDateRangeChangedMessage(new DateRange(selectedRange.Period.Start, selectedRange.Period.End)));
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if (isLoadMoreBlocked) return;
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// Send the loading message initiated by the app.
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if (SelectedDateRangeIndex == DayRanges.Count - 1)
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{
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// Load next, starting from the end date.
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_ = LoadMoreAsync(CalendarLoadDirection.Next);
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}
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else if (SelectedDateRangeIndex == 0)
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{
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// Load previous, starting from the start date.
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_ = LoadMoreAsync(CalendarLoadDirection.Previous);
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}
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}
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private async Task LoadMoreAsync(CalendarLoadDirection direction)
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{
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Debug.WriteLine($"Loading {direction} items.");
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try
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{
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await _calendarLoadingSemaphore.WaitAsync();
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await RenderDatesAsync(CalendarInitInitiative.App, calendarLoadDirection: direction);
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}
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catch (Exception)
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{
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Debugger.Break();
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}
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finally
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{
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_calendarLoadingSemaphore.Release();
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}
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}
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public void Receive(CalendarSettingsUpdatedMessage message)
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{
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_currentSettings = _preferencesService.GetCurrentCalendarSettings();
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// TODO: This might need throttling due to slider in the settings page for hour height.
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// or make sure the slider does not update on each tick but on focus lost.
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Messenger.Send(new LoadCalendarMessage(DateTime.UtcNow.Date, CalendarInitInitiative.App, true));
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}
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}
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}
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